Vitaliy Raskalov and Vadim Makhorov recently scaled the second-tallest building in the world, China's 128-floor Shanghai Tower, without ropes or harnesses, Time reports. And we can attest to the fact that even watching their video of the experience (in which they go so far as to climb a crane on top of the partially-constructed 2,073-foot building, the Telegraph notes) is pretty intense. The Russian thrill-seekers say it took them two hours to get to the top of the building, under the cover of night, before scaling the crane. They also claim they were "not afraid at all." (More Shanghai Tower stories.)